/* RF Grid: schematic / datasheet style. Paper, ink, hairlines, one signal colour. Light only. */
:root {
  --ink: #16191d;
  --ink-2: #3b4148;
  --muted: #6b737c;
  --paper: #fbfbf8;
  --paper-2: #f3f3ee;
  --line: #d9dbd6;
  --grid: rgba(22, 25, 29, .045);
  --signal: #1f5fbf;
  --signal-ink: #174a96;
  --field: #ffffff;
  --ok: #1d7a46;
  --err: #b4321f;
  --mono: ui-monospace, "JetBrains Mono", "IBM Plex Mono", "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; color: var(--ink-2); font: 16px/1.65 var(--sans); -webkit-font-smoothing: antialiased;
       background-color: var(--paper);
       /* engineering paper: 8 px minor grid, 40 px major grid */
       background-image:
         linear-gradient(var(--grid) 1px, transparent 1px),
         linear-gradient(90deg, var(--grid) 1px, transparent 1px),
         linear-gradient(var(--grid) 1px, transparent 1px),
         linear-gradient(90deg, var(--grid) 1px, transparent 1px);
       background-size: 40px 40px, 40px 40px, 8px 8px, 8px 8px; }
h1, h2, h3 { color: var(--ink); margin: 0; font-weight: 600; letter-spacing: -0.015em; line-height: 1.15; }
a { color: var(--signal-ink); text-underline-offset: 3px; text-decoration-thickness: 1px; }
img { max-width: 100%; height: auto; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; z-index: 100; background: var(--paper); padding: 8px 12px; }

/* monospace labels, like reference designators on a schematic */
.eyebrow { font: 500 12px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase;
           color: var(--muted); margin: 0 0 16px; display: flex; align-items: center; gap: 10px; }
.eyebrow::before { content: ""; width: 24px; height: 1px; background: var(--signal); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--paper) 92%, transparent);
               backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink);
         font: 600 14px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; white-space: nowrap; }
.brand img { height: 28px; width: auto; }
.nav { display: flex; align-items: center; gap: 2px; }
.nav a { color: var(--ink-2); text-decoration: none; font-size: 14px; padding: 6px 12px; white-space: nowrap; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); box-shadow: inset 0 -1px 0 var(--signal); }
.nav .nav-phone { font-family: var(--mono); font-size: 13px; color: var(--signal-ink); }

/* Hero */
.hero { border-bottom: 1px solid var(--line); }
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; padding-top: 56px; padding-bottom: 72px; }
.hero h1 { font-size: clamp(2.2rem, 4.6vw, 3.5rem); font-weight: 600; letter-spacing: -0.025em; }
.hero .lede { font-size: 1.12rem; max-width: 32em; margin: 20px 0 28px; }
.hero-art { display: grid; gap: 18px; }
.scope { --scope-line: #aeb4ba; margin: 0; border: 1px solid var(--scope-line); border-radius: 12px; background: var(--paper);
         padding: 12px 16px 8px; box-shadow: 0 1px 0 rgba(22, 25, 29, .04); }
.scope figcaption { font: 500 12px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2);
                    padding-bottom: 10px; margin-bottom: 4px; border-bottom: 1px solid var(--scope-line); }
.scope svg { display: block; width: 100%; height: auto; font-family: var(--mono); }
.scope .frame { fill: none; stroke: #7d858d; stroke-width: 1; }
.scope .div { stroke: #d3d6d2; stroke-width: 1; stroke-dasharray: 2 3; }
.scope .band-label { font-size: 19px; font-weight: 600; fill: var(--signal-ink); letter-spacing: .06em; }
.scope .edge { stroke: var(--ink-2); stroke-width: 1; }
.scope .range { font-size: 16px; fill: var(--ink-2); }
.scope .tick, .scope .unit { font-size: 15px; fill: var(--muted); }
.scope .trace { fill: none; stroke: var(--signal); stroke-width: 1.4; stroke-linejoin: round; }
.scope .hold { fill: none; stroke: var(--signal); stroke-width: 1; opacity: .35; }
.scope .fill { fill: var(--signal); opacity: .06; }
.scope .guide { fill: none; stroke: var(--muted); stroke-width: 1; stroke-dasharray: 3 3; }
.scope .note { font-size: 13px; fill: var(--ink-2); }
.scope .marker { fill: var(--ink); }
.scope .wf-bg { fill: #eef1f4; stroke: #c5cacf; stroke-width: 1; }
.scope .wf { fill: var(--signal); }
/* dark oscilloscope screen (variants with the "dark" feature) */
.scope:has(svg.dark) { --scope-line: #2b3a42; background: #0b1114; border-color: #33434b; }
.scope:has(svg.dark) figcaption { color: #9fb3bd; }
.scope .dark .frame { stroke: #4f646e; } .scope .dark .div { stroke: #1f2c33; }
.scope .dark .trace { stroke: #5ee6c8; } .scope .dark .hold { stroke: #5ee6c8; } .scope .dark .fill { fill: #5ee6c8; }
.scope .dark .band-label { fill: #8be9d4; } .scope .dark .edge { stroke: #9fb3bd; } .scope .dark .range { fill: #c9d6dc; }
.scope .dark .tick, .scope .dark .unit { fill: #7f939c; } .scope .dark .note { fill: #c9d6dc; } .scope .dark .marker { fill: #e8f3f1; }
.scope-variants { display: grid; grid-template-columns: repeat(auto-fit, minmax(460px, 1fr)); gap: 48px 40px; }
.scope-variants article p { margin: 6px 0 14px; color: var(--muted); font-size: 15px; }
.scope-variants small { font: 12px var(--mono); color: var(--muted); }
.scope-variants .gal-id { font-size: 18px; margin-right: 6px; }

/* Public safety: who the licensed systems serve */
.safety-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.safety-intro p { margin: 0 0 14px; }
.safety-intro .lead { font-size: 1.15rem; color: var(--ink); }
.users { list-style: none; padding: 0; margin: 48px 0 0; display: grid; grid-template-columns: repeat(4, 1fr);
         border-top: 1px solid var(--ink); border-left: 1px solid var(--line); }
.users li { border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 28px 20px 22px;
            display: flex; flex-direction: column; align-items: center; text-align: center; gap: 14px; background: var(--paper); }
.users img { width: 100%; max-width: 150px; height: auto; }
.users span { font: 500 12px/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2); }

/* Buttons */
.cta { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: 500 15px/1 var(--sans);
       padding: 13px 22px; border: 1px solid var(--ink); background: transparent; color: var(--ink);
       text-decoration: none; cursor: pointer; transition: background .15s, color .15s, border-color .15s; }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--signal); border-color: var(--signal); color: #fff; }
.btn-primary:disabled { opacity: .6; cursor: progress; }
.btn-ghost:hover { border-color: var(--signal); color: var(--signal-ink); }
.btn-sm { padding: 5px 10px; font-size: 12px; font-family: var(--mono); border-color: var(--line); color: var(--ink-2); }
.btn-sm:hover { border-color: var(--ink); color: var(--ink); }

/* Sections */
.section { padding: 88px 0; border-bottom: 1px solid var(--line); }
.section-alt { background: color-mix(in srgb, var(--paper-2) 70%, transparent); }
.section h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); margin-bottom: 16px; }
.split { display: grid; grid-template-columns: 1fr 1.25fr; gap: 64px; align-items: start; }

/* Services: a parts list */
.services { list-style: none; padding: 0; margin: 36px 0 0; border-top: 1px solid var(--ink); counter-reset: svc; }
.services li { counter-increment: svc; display: grid; grid-template-columns: 72px 1fr; align-items: baseline;
               padding: 20px 0; border-bottom: 1px solid var(--line); }
.services li::before { content: "S" counter(svc, decimal-leading-zero); font: 500 13px/1 var(--mono);
                       color: var(--signal-ink); letter-spacing: .06em; }
.services h3 { font-size: 1.15rem; font-weight: 500; }

.checks { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 12px; counter-reset: chk; }
.checks li { counter-increment: chk; padding-left: 40px; position: relative; }
.checks li::before { content: counter(chk, decimal-leading-zero); position: absolute; left: 0; top: .2em;
                     font: 500 12px/1.4 var(--mono); color: var(--signal-ink); }

.contact-facts { display: grid; grid-template-columns: auto 1fr; gap: 12px 24px; margin: 28px 0 0; }
.contact-facts dt { font: 500 12px/1.9 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.contact-facts dd { margin: 0; color: var(--ink); }

.page-head { padding: 72px 0 56px; border-bottom: 1px solid var(--line); }
.page-head h1 { font-size: clamp(2.1rem, 4.4vw, 3rem); }
.page-head .lede { font-size: 1.1rem; max-width: 36em; margin: 16px 0 0; }
.section-tight { padding: 56px 0 88px; }
.h3 { font-size: 1.25rem; margin-bottom: 4px; }
.aside { margin-top: 28px; color: var(--muted); }

/* Forms */
.card { background: var(--paper); border: 1px solid var(--line); padding: 28px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 22px; }
.field { display: flex; flex-direction: column; gap: 6px; font: 500 12px/1.4 var(--mono); letter-spacing: .06em;
         text-transform: uppercase; color: var(--ink-2); }
.field.wide { grid-column: 1 / -1; }
.field em { font-style: normal; color: var(--muted); text-transform: none; letter-spacing: 0; }
.field input, .field textarea { font: 400 16px/1.4 var(--sans); letter-spacing: 0; text-transform: none; color: var(--ink);
  background: var(--field); border: 1px solid var(--line); border-radius: 0; padding: 10px 12px; width: 100%; }
.field textarea { resize: vertical; min-height: 120px; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--signal); box-shadow: 0 0 0 1px var(--signal); }
.field .error { color: var(--err); text-transform: none; letter-spacing: 0; }
.field .error:empty { display: none; }
.has-error input, .has-error textarea { border-color: var(--err); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-msg { margin: 14px 0 0; font-weight: 500; min-height: 1.5em; }
.form-msg:empty { display: none; }
.form-msg.ok { color: var(--ok); }
.form-msg.err { color: var(--err); }

/* Upload */
.dropzone { position: relative; display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 36px 20px; border: 1px dashed var(--muted); text-align: center; cursor: pointer;
  transition: border-color .15s, background .15s; color: var(--muted); font-size: 14px; }
.dropzone strong { color: var(--ink); font-size: 16px; font-weight: 500; }
.dropzone u { color: var(--signal-ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.dropzone svg { width: 30px; height: 30px; fill: none; stroke: var(--signal); stroke-width: 1.4;
  stroke-linecap: square; margin-bottom: 6px; }
.dropzone input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.dropzone:hover, .dropzone.over, .dropzone:focus-within { border-color: var(--signal); border-style: solid;
  background: color-mix(in srgb, var(--signal) 4%, transparent); }
.queue { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 8px; }
.queue li { border: 1px solid var(--line); padding: 12px 14px; background: var(--field); }
.q-top { display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.q-name { font-weight: 500; color: var(--ink); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.q-actions { display: flex; gap: 6px; flex: none; }
.q-bar { height: 2px; background: var(--line); overflow: hidden; margin: 12px 0 8px; }
.q-bar i { display: block; height: 100%; width: 0; background: var(--signal); transition: width .3s; }
.q-status { font: 12px/1.4 var(--mono); color: var(--muted); font-variant-numeric: tabular-nums; }
.queue li.done .q-bar i { background: var(--ok); }
.queue li.done .q-status { color: var(--ok); }
.queue li.failed .q-status { color: var(--err); }

/* Footer */
.site-footer { padding: 48px 0 28px; font-size: 14px; color: var(--muted); }
.site-footer strong { font: 500 12px/1.8 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.site-footer div { color: var(--ink-2); }
.footer-inner { display: flex; flex-wrap: wrap; gap: 48px; align-items: flex-start; }
.footer-logo { width: 72px; margin-right: auto; }
.copyright { margin-top: 36px; padding-top: 18px; border-top: 1px solid var(--line); font: 12px/1 var(--mono); color: var(--muted); }

@media (max-width: 860px) {
  .split, .hero-inner, .safety-intro { grid-template-columns: 1fr; gap: 32px; }
  .users { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 64px 0; }
  .hero-inner { padding-top: 56px; padding-bottom: 56px; }
}
@media (max-width: 640px) {
  .wrap { padding-left: 16px; padding-right: 16px; }
  .nav a:not(.nav-phone) { padding: 6px 8px; font-size: 13px; }
  .nav .nav-phone, .nav a[href="/#public-safety"] { display: none; }
  .grid2 { grid-template-columns: 1fr; }
  .card { padding: 20px; }
  .services li { grid-template-columns: 52px 1fr; padding: 16px 0; }
  .services h3 { font-size: 1.05rem; }
  .page-head { padding: 48px 0 40px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* Gallery (/gallery): past versions of the site */
.gal-index { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.gal-index a { font: 500 13px/1 var(--mono); padding: 8px 12px; border: 1px solid var(--line); text-decoration: none;
               color: var(--ink); background: var(--paper); }
.gal-index a:hover { border-color: var(--signal); color: var(--signal-ink); }
.gal-version { padding: 56px 0; }
.gal-head { display: grid; grid-template-columns: 72px 1fr; gap: 16px; align-items: start; margin-bottom: 24px; }
.gal-id { font: 600 28px/1 var(--mono); color: var(--signal-ink); }
.gal-meta { margin: 4px 0 0; font: 12px/1.5 var(--mono); color: var(--muted); }
.gal-body { margin: 8px 0 0; max-width: 60em; white-space: pre-line; font-size: 15px; }
.gal-shots { display: flex; gap: 20px; align-items: flex-start; margin-top: 16px; }
.gal-shot { margin: 0; }
.gal-desktop { flex: 1 1 auto; min-width: 0; }
.gal-phone { flex: 0 0 220px; }
.gal-frame { display: block; height: 520px; overflow-y: auto; border: 1px solid var(--line); background: var(--paper); }
.gal-frame img { display: block; width: 100%; height: auto; }
.gal-shot figcaption { font: 12px/1 var(--mono); color: var(--muted); margin-top: 8px; }
@media (max-width: 640px) {
  .scope-variants { grid-template-columns: 1fr; }
  .gal-shots { flex-direction: column; }
  .gal-phone { flex-basis: auto; width: 60%; }
  .gal-frame { height: 420px; }
}

/* /gallery/logo */
.logo-compare { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 20px; }
.logo-compare figure, .logo-files figure { margin: 0; }
.logo-tile { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 24px; height: 340px;
             display: flex; align-items: center; justify-content: center; }
.logo-tile img { display: block; max-width: 100%; max-height: 100%; width: auto; height: auto; }
.logo-tile-dark { background: var(--ink); border-color: var(--ink); margin-top: 10px; }
.logo-files { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 20px; }
.logo-files .logo-tile { height: 240px; }
.logo-compare figcaption, .logo-files figcaption { font: 12px/1.5 var(--mono); color: var(--muted); margin-top: 8px; }
.logo-pair { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 14px; max-width: 520px; }
.logo-pair figure { margin: 0; }
.logo-pair .logo-tile { height: 210px; margin-top: 0; padding: 14px; }
.logo-version { padding: 36px 0; }
.logo-version .gal-head { margin-bottom: 0; }
.logo-pair figcaption { font: 12px/1.5 var(--mono); margin-top: 8px; }
.logo-og { margin: 16px 0 0; max-width: 720px; }
.logo-og img { display: block; width: 100%; height: auto; border: 1px solid var(--line); border-radius: 10px; }
.logo-og figcaption { font: 12px/1.5 var(--mono); margin-top: 8px; }
@media (max-width: 860px) { .logo-compare, .logo-files, .logo-pair { grid-template-columns: 1fr; } .logo-pair .logo-tile { height: 200px; } }